[Black Shark Aquarium Air Pump] Size 4.296.184.29in, which is larger than the ordinary 2-outlets aquarium aerator. The shape design that imitates sharks can adds some fun to aquarium lovers. [Double-layer Design for Silence] Most aquarium air pumps have only a single-layer casing. This aquarium aerator pump adopts the design of internal air pump + external black shark casing, which greatly reduces the noise, and the max noise does not exceed 35dB. [ON/OFF Button] This aquarium oxygen pump is equipped with a ON/OFF button, most of the aquarium oxygen pumps do not have. So that you don’t need to unplug or plug in the plug frequently, which is more convenient to use.